Outsidepride Aster Tall Needle Rose Flower Seed - 1000 Seeds Aster Tall Needle Unicum Rose grows as an annual in USDA Zones: 3 - 9 and does best in full sun to partial shade areas. Callistephus, also known as China Aster grows up to 24 inches in height and makes a perfect cut flower with long vase life. This flower has large rose colored blooms from early summer to fall, they are often used in cutting gardens or flower borders. Sow these heirloom seeds at 3 - 5 seeds per plant in well-drained soil and keep moist until germination occurs in 7 - 21 days. Our seeds are always Non-GMO and packaged for the current year.